Just wondering: is there a concordance between the "mynediad, sylvaen, ..." Welsh language proficiency levels and the O-level and A-level? If so, how do they relate?
This link shows how the courses fit in with the Common European Framework...http://www.wjec.co.uk/qualifications/welsh-for-adults/
The school courses at 'O' and now GCSE level were supposed to be equivalent to the 3rd level of Welsh for Adult courses, ie Canolradd, and the 'A' level was supposed to relate to the 'Uwch' Welsh for adults courses.
But because of the way the second language school courses are so much based on exams and rote learning this is not true at all in practice.
In my experience someone will a good result at 'O' or GCSE in school would fit into either the second year of Mynediad or the first year of Sylfaen.
A level success would lead to probably the second year of Sylfaen or the first year of Canolradd.